No, it's not. A few high listings doesn't mean they'll sell. Hell I could buy one and list it for $1000, does that make it worth that much? Nope, it'll mean that I'll be stuck with it until the price comes down. Not my prob.
I have Subsistence. Actually I have all the MG titles starting from the NES. Plus the not-so-official NES sequel, the real Japan sequel included on 3: Subsis, the GBC game and the VR missions on PS1.